pepper

black pepper / white pepper

black pepper is the dried, fullgrown but unripe fruit of the perenial woody
vine
piper nigrum l, while white pepper is obtained from the dried
ripe fruit by
removing the outer portion of the pericarp after soaking in water [01]

long pepper

long pepper contains the alkaloid piperine (about 6%),
which is slightly higher than that in black pepper. [25]

... we performed a quantitative determination of piperine in three different
pepper species ... black, white and green pepper.
we used HPLC with a 70% methanol-30%water eluent. the results are as
follows: